diff --git a/fs/dax.c b/fs/dax.c
index d5f6aca..206650f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -246,6 +246,7 @@
 	loff_t end = pos + iov_iter_count(iter);
 
 	memset(&bh, 0, sizeof(bh));
+	bh.b_bdev = inode->i_sb->s_bdev;
 
 	if ((flags & DIO_LOCKING) && iov_iter_rw(iter) == READ) {
 		struct address_space *mapping = inode->i_mapping;
@@ -607,6 +608,7 @@
 
 	memset(&bh, 0, sizeof(bh));
 	block = (sector_t)vmf->pgoff << (PAGE_SHIFT - blkbits);
+	bh.b_bdev = inode->i_sb->s_bdev;
 	bh.b_size = PAGE_SIZE;
 
  repeat:
@@ -1078,6 +1080,7 @@
 	BUG_ON((offset + length) > PAGE_CACHE_SIZE);
 
 	memset(&bh, 0, sizeof(bh));
+	bh.b_bdev = inode->i_sb->s_bdev;
 	bh.b_size = PAGE_CACHE_SIZE;
 	err = get_block(inode, index, &bh, 0);
 	if (err < 0)